schutz



J.v M. SCHUTZ.

SELF CONTAINED PULVERIZING AND SEPARATING MILL. APPLICATION FILED JULY 22.1915.

1,305,4: 1 3. Patented June 3, 1919.

6 SHEETS-SHEET I'- J. M.-SCHUTZ.

SELF CONTAINED PULVERIZ ING AND SEPARATING MILL.

APPLICATION FILED JULY 22. I915.

l 305,4 1 3 Patented June 3, 1919.

6 SHEETS-SHEET 2.

% IIIIII W J. M. SCHUTZ'. SELF comma) PULVERIZING AND SEPARATING MILL.

APPLICATION FILED lULY 22. l9l5.'

Patented June 3, 1919.

6 SHEETS-SHEET 3.

wi a J. M. SCHUTZ.

- SELF CONLAINQD PULVERIZING AND SEPARATING MILL APPLICATION FILED JULY 22. ms.

6 SHEETS-SHEET 4.

7 1,305,413. v v Patented June 3, 1919;

J. M. SCHUTZ.

SELF CONTAINED PULVERIZING AND SEPARATING MILL.

' APPLICATION FILED JULY 22, 19:5.

1 305,4 1-3. Patented June 3, 1919.

6 SHEETS-SHEET 5.

J. M.-SCHUTZ. SELF CONTAINED PULVERIZING ANB-SEPARATING MILL.

APPLICATION FILED JULY 22.1915. I

1,305, 11 3. I I PatentedJune 3,1919.

6 SHEETSSHEET 6.

mew?- Jmg ZaZZScM Q UNITED STATES PATENT OFFICE.

JOSEPH MARTIN SCHUT Z, OF CHICAGO, ILLINOIS, ASSIGNOR TO SCHUTZ HAWLEY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SELF-CONTAINED PULVERIZING AND SEPARATING MILL.

Specification of Letters Patent. Patented June 3, 1919.

Application filed July 22, 1915. Serial No. 41,340.

To all whom it may concern:

Be it known that I, JOSEPH MARTIN 'SCHUTZ, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pulverizing and Collecting Apparatus Known as Self-Contained Pulverizing and Separating Mills, of which the following is a specification.

My invention relates to improvements in apparatus for pulv'erizing various materials and for separating or collecting the pulverized products. The invention has especial reference to improvements in means for continuously pulverizing and separating materials such as coal, limestone, talc, gypsum, clay, iron ore, chalk, paint rock, colors, graphite, marl, phosphates, borax, salt, sugar, drugs, dyes, and both crystallized and oxidized minerals generally.

Many materials are capable of reduction by attrition mills, but I have found disinteg'ration mills to have a wider range of usefulness and greater capacity. Such mills are characterized by hammers or heaters which are rotated at high speed and that set up air currents of large volume and high velocity. In such mills the air current is depended upon to carry away the pulverized product and the final recovery of lthe material is accomplished by separating it from the vehicular air by meansof cloth bags or settling chambers.

The greatest care does not sufiice to pre-' vent the loss of an annoyingly large part of the finest product. Another objection to disintegration mills is that they are diflicult to adjust when it is desired to-vary the quality of the product or to change from one material or stock to another.

drawback is that such mills, with their air trunks, piping and collectors, occupy a great deal of room. They also require constant attention; and their collectors or separators must be cleaned frequently, else the How of mill and separator in one and the same machine. and so constructed that each shall form a part of and complete the other; whereby the above mentioned and other ob- Another jectionable features of the ordinary apparatus may be overcome and eliminated.

Still further objects of my invention will appear hereinafter.

The preferred manner in which I attain this and other objects of the invention will be understood upon reference to the accompanying drawings, forming part of this specification, and in which Figure 1 is a side elevation of a selfcontained pulverizing and separating mill, embodying my invention; Fig. 2 is an elevation of the discharge end of the mill; Fig. 3 is an elevation of the other, or driving end of the machine; Fig. 4 is transverse vertical section on the line 44 of Fig. 1;

Fig. 5 is a longitudinal vertical section on.

gitudinal section illustrating a modified form of my mill, the section being taken on the line l5--15 of Fig. 16 viewed in the direction of the arrow, 15*; and Fig. 16 is a vertical transverse section of the mill on the line 16 16 of Fig. 15, viewed in the direction ofth arrow 16.

In the Pre erred form of my invention shown in the drawings, my mill comprises a lower part and an upper part, and two air trunks that join them. The material is fed into the'lower part and is there pulverized. The operation of the lower part of the mill sets up strong movements or currents of air that pass through one of the air trunks into the upper part of the mill and return from thence to the lower part, The whole pulverized product i. e., both the fine and the coarse particles, pass from the lower to the upper part through the air trunk referred to. On entering the upper part of the mill the stream (of air and pulverized material) expands. I take advantage of the centrifugal action of the particles coupled with' the expansion of the air to secure a separation of the fine from the coarse particles, and return the coarse particles or tailings to the lower part of the mill, preferably through the other air trunk. I construct the machine in such manner that the fine particles which are separated and collected in the upper part of the mill may be discharged in a solid stream, substantially free from air; or when desired the fine material may be air-floated from the upper part of the mill and discharged into ordinary collectors. From the description which follows, it will also be apparent that I may employ my machine for the centrifugal separation of one grade of material and for the air-flotation of the finer grades. By very simple means I provide for the regulation and control of the quality of the pulverized product, and provide for the adjustment of the machine without interrupting its operation.

Referring now to Figs. 1 to 7, inclusive, it will be seen that the lower part of my inachine is in the form of a cylinder, having a horizontal axis occupied by the main shaft, 2. The ends of the cylinder contain central openings, 3, for purposes to be described. The cylinder is parted upon a vertical plane which includes its axis. One-half, a, is preferably cast integrally with the feed chute, a", and is permanently fastened to the base, I). The other half, of, is secured to the base and to the part, a, by means of bolts, 4i, and when these are removed the part, a may be taken off the base, as required to clean the machine or repair the parts in the drum. The bottom of the drum contains a preferably corrugated lining made in two parts, 5 and 6. These parts are held in place by the deflecting plate, 7 of the feed chute, and by the locking plate, 7, in the part, a A feed hopper, 8, is placed on the chute and contains a feed roll, 9. 10 is the feed adjustment plate of the feed hopper.

It will be noted that the cylinder, a.a is provided with two upwardly extending tangential ducts, 11 and 12. The duct, 11, rises from the side of the drum opposite the feed chute; and, the duct, 12, opens downwardly into the feed chute, directly above the deflecting plate, 7.

The shaft, 2, is carried by the pillow blocks, 7), b, on the base, 6, and is driven by a belt (not shown) on the pulleys, 2'. WVithin the cylinder or drum, (Z-a the shaft is provided with a series of collars, 11, which are keyed thereto and serve as the mountings for the hammers or heaters, 15, which preferably are pivotally attached thereto, as shown. There are many of these hammers and when the shaft is rotated in the direction of the arrows in Fig. 4, they forcibly break and disintegrate the material which enters through the feed chute, 4. Their operation in connection with an apposed corrugated wall like that shown herein is now too well understood to require detailed explanation. It is sufficient to say, that in rotating they perform the double purpose of breaking up the material and setting up currents of air by which the material is discharged or expelled from the mill. They operate to draw air into the cylinder and discharge the same and the material at high velocity through the tangential outlet and duct, 11.

Before passing on to the consideration of the means which I employ for separating the pulverized material from the vehicular air and for separating the fine from the coarse material, it should be noted that my pulverizing mill is most convenient in that it'may be easily cleaned and repaired. For that purpose it is unnecessary to remove the ends of the pulverizing cylinder, for the whole side, of, may be removed without dis turbing any other part. When the machine is opened in this way the heaters are accessible and obviously the linings may be removed and replaced and the whole interior thoroughly and quickly cleaned and repaired with little delay and effort.

The ducts, 11 and 12, are preferably (though as shown in Figs. 15 and 16 not necessarily) of the same length as the pulverizing cylinder. They are the lower ends of the air trunks referred to above, and serve to join the pulverizing cylinder with the separating cylinder or drum, 0. Thus, as shown in Figs. 1 to 8, d and e are the air trunks, and those as shown are tangentially positioned with respect to the drum, 0. The drum, 0, is preferably of the same length as the drum, aa and the air trunks d and c are preferably of the same cross section as 11 and 12. I prefer that the parts or legs, 11 and 12, shall be formed in the same casting with the drum, 0, and when necessary the whole top may be lifted off as one part.

The ends of the separating drum, 0, are closed by plates, 0', and c and these contain central openings of sizes determined by the character of the work to be done, as hereinafter described. Thus, as shown in Figs. 1 to 8, the plates 0 0 contain relatively small openings, 0 which are placed in'communication with the openings, 3, 3, of the pulverizing cylinder by means of pressure relief or down ducts, 16, 16. The down ducts are connected with the openings, 3, through the medium of preferably conical cavities, 16, in the ends of the pulverizing drum, as well shown in Fig. 5. Valves, 16*, located in those portions of the down ducts within the pulverizing mill, provide for the easy control of the pressure at the axes of the separating drum, and supplement the action of the skimmer hereinafter described.

Referring to Fig. 4 it will be seen that the bottom 0, of the drum, 0, is preferably formed on a. shorter radius than the top and sides of the drum and merges with the inner walls of the air ducts, d and e. The bottom contains a longitudinal and horizontal slot, 17, adjacent its juncture with the inner wall of the trunk, d. This slot communicates with a valve and conveyer casing, 18. The casing contains a rotary valve, 19, and a conveyer, 20. It is open at one end of the conveyer, as shown in Fig. 6. A discharge device is applied at this point, the samecomprising a head, 21, secured to the plate, 0 and having a short spout, 21.

At the juncture of the bottom, a, and the inner wall of the air trunk, e, I place a deflecting valve or skimmer, 22, securing same by means of a horizontal, longitudinal shaft, 23, journaled in the ends of drum, 0. One end of the valve shaft, 23, is equipped with an adjusting lever, 24, and a quadrant and set screw, 25, are provided for securing the lever, 24, and the skimmer, 22, in determined positions.

The shafts, 19' and 20', of valve 19 and conveyer, 20, respectively, are held in suitable stufiing boxes and bearings, 26, and at one end are connected by gears, 27, which provide for the rotation of the valve at higher speed than the conveyer. A large pulley, 28, on the shaft, 19, is connected with the small pulley, 29, on the shaft, 2, by means of a belt, 30; and obviously the valve and conveyer operate continuously as long as the heaters are in operation. As a convenient means of driving the feed roll, 9, I employ a ratchet mechanism, 31, connected to crank, 27 on the larger gear, 27, as by means of a rod, 32.

The operation of the mill, assuming the main shaft and heaters, and the valve, the conveyer and the feed roll to be in rotation, is as follows The material which falls from the roll, 9, passes into the pulverizing cylinder, aa and is there attacked and disintegrated by the heaters and finally driven and carried upward through the air trunk, d. Thus both large and small particles of ,material and a large volume of air under considerable pressure enter the separating and collecting drum, 0, at very high veloclty. The particles are flung against the periphery of the drum, 0, and sweep across the same toward the skimmer, 22. The heavier particles or tailings naturally follow the wall and de scending through the trunk, e, are forcibly impelled against the plate, 7. On striking the plate the material is deflected inward against the heaters, joining the flow from the feeder.

The air on emerging from the trunk, d, expands, and a considerable part of the stream, carrying the finer particles of ma terial, strikes and is deflected by the valve or" skimmer, 22; Thereby, the particles of material are projected against the skimmer and the bottom, a, of the drum, and sweep into the slot, 17 By reason of the presence .of the valve, 19, the slot obviously opens into a deadair space, and hence the fine material is deposited upon the valve and is discharged upon the conveyer, 20, which ultimatelyexpels the material in the form of a solid stream at the spout, 21'.

As the air removed from the main stream by the skimmer whirling within the drum, 0, cannot find escape at the slot, 17 it ultimately frees itself from practically all of the fine material or dust and escapes through the central relief opening, 0 and the down ducts, 16, thus reenterin the pulverizing mill. When desired, a nlce adjustment of the pressure of air at the relief openings, 0 maybe secured by means of the valves or dampers 16 in the down ducts; and when a skimmer is not used, these valves, 16, constitute the best means of regulation. It will be clear that the rotating beaters draw the air through the down ducts. By this means I maintain a lower pressure at the axis at the drum, 0, than at its periphery, and effectually insure the rapid separation of the fine from the coarse material. By this means also I make it possible to limit the volume of air handled by the machine to that required to fill the air belt constituted by two drums and the two air trunks, plus the down ducts. Clearly, the only fresh air that need enter through the feed hopper is measured by the small quantity which is discharged through the valve casing, 18.

By the mere act of changing the position of the skimmer or deflecting valve, 22, I am able to regulate the fineness or quality, of the product at'the discharge spout, 21. And by changing the position of one or both valves, 16, a still finer separation may be attained.

Numerous modifications are made possible by the convenient form and relation of the separating drum and the air ducts. Several of these modifications are disclosed in Figs. 9 to 14. p

In Fig. 9 I have shown a structure differing from that above described, in that the drum contains an inner wall, 0*, having an opening for the skimmer. In this form I make a double separation by retaining the discharge slot and valve, and adding larger central openings in the head of the drum, through which material may be floated to the trunk or trunks, 33, leading to a suitable dust collector (not shown).

An arrangement limited to an air floated product is shown in Fig. 10; in-wlrich case the pulverizer furnishes a constant supply of fresh air; and the return of the air to the mill is prevented by a rotary valve, 34, arranged in the return air trunk. It should be understood that when the separator shown in Fig. 10 is placed on the base mill, the

down ducts 16 of the latter are left open to receive air; and the necessary regulation is secured by adjusting the valves, 16*, therein. This is also true in the cases of Figs. 9, l1 and 14:.

In Fig. 11 I have shown another form of separator adapted to produce two grades of material; 35 being the air float trunk, and 36 being a tailings discharge duct, contain ing an air stoppage valve, 37

That the discharge of the material may be accomplished in the central bottom portion of the drum, is clearly shown by-Fig. 12. It may also be discharged at one side of the drum, as shown in Fig. 13. Both Figs. 12 and 13 forms possess the advantage of having settling pockets, 38 and 39.

Fig. 13 also shows that the separator may be employed for separating the fine material from the tailings without special regard to the relief and return of all of the air to the pulverizer. And as shown inFig. 13 the air, which is separated from the main stream by the skimmer, finds direct relief at the opening 39 which preferably contains a conveyer 39", discharging into a suitable collector.

Fig. 14 illustrates a modified form of an air floating separator in which I employ a precautionary by pass, 40, containing a valve, 41, for ridding the bottom of the drum of material which might otherwise lodge therein. This is of particular advantage in handling moist materials.

Thus far I have described only that form of my mill in which the air trunks are of the same cross sectional length as the pulverizing cylinder. There are same cases in which it is desirable to expose the material or stock to the action of the beaters for a longer time. In such cases I prefer to modify the construction in the manner generally depicted in Figs. 15 and 16 where the material is fed to the beaters through a feed spout, 42, arranged on one end of the pulverizing cylinder, and the air belt 43 is limited to the opposite end of the pulverizing cylinder. In this case the air trunks are of less length than the drum, and this is also true of the separating cylinder, 44. Except for the modified shapes of the air trunks and down ducts, 45, 46, this mill is substantially the same as the one before described and its principle of operation is substantially the same.

I claim each and every of the following parts, improvements and combinations:

1. The improvement herein described comprising a rotary heater, in combination with a co-acting shell surrounding the same and having air-intake openings in its ends, a chute communicating with the interior of the shell and through which the material to be milled is fed, a tangential outlet for said shell, a reversely positioned tangential inlet therefor, a drum superimposed upon said shell and having air outlet openings in its ends and which are in communication with respective air-intake openings in the ends of said shell, said drum having a tangential intake which joins the tangential outlet of said shell and a tangential outlet which joins the tangential inlet of said shell, and means for continually removing material from said drum, substantially as described.

2. The improvement herein described comprising a rotary beater, in combination with a coacting shell surrounding the same, and having air-intake openings in its ends, a chute communicating with the' interior of the shell and through which the material to be milled is fed, a tangential outlet for said shell, a reversely positioned tangential inlet therefor, a drum superimposed upon said shell and having air outlet openings in its ends and which are in communication with respective air-intake openings in the ends of said shell, said drum having a tangential intake which joins the tangential outlet of said shell and a tan ential outlet which joins the tangential inlet of said shell, and an adjustable skimmer positioned at the tangential outlet of said drum for separating fine from coarse material, the former for removal from the drum and the latter for return to said shell, substantiallyas de scribed.

3. The improvement herein described comprising a rotary beater, in combination with a coacting shell surrounding the same, and having air-intake openings in its ends, a chute communicating with the interior of the shell and through which the material to be milled is fed, a tangential outlet for said shell, a reversely positioned tangential inlet therefor, a drum superimposed upon said shell and having air outlet openings in its ends and which are in communication with respective air-intake openings in the ends of said shell, said drum having a tangential intake which joins the tangential outlet of said shell and a tangential outlet which joins the tangential inlet of said shell, and means for controlling the return flow of air through the air passages which connect the ends of the drum with the ends of the said shell, substantially as described.

In testimony whereof, I have hereunto set my hand, this 20th day of July, 1915.

JOSEPH MARTIN SCHUTZ. 

